I've been playing for four years. About Counterstrike: Source, I would wait because they cracked down on ppl who were on the servers ahead of the release. Possible chance they'll ban you're Ip. But hey, looks crazy good. CS is good stuff and you should keep it up.

Never played CounterStrike before, never will. (I think those kind of FPS games suck, the one has just a few more weapons than the other, and the enemies get an extra brain fraction every 4 FPS games. I don't think CS will be better.)